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      1 /*
      2  * Copyright (C)2011 D. R. Commander.  All Rights Reserved.
      3  * Copyright (C)2015 Viktor Szathmry.  All Rights Reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  * - Redistributions of source code must retain the above copyright notice,
      9  *   this list of conditions and the following disclaimer.
     10  * - Redistributions in binary form must reproduce the above copyright notice,
     11  *   this list of conditions and the following disclaimer in the documentation
     12  *   and/or other materials provided with the distribution.
     13  * - Neither the name of the libjpeg-turbo Project nor the names of its
     14  *   contributors may be used to endorse or promote products derived from this
     15  *   software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
     18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
     21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 package org.libjpegturbo.turbojpeg;
     31 
     32 /**
     33  * Fractional scaling factor
     34  */
     35 public class TJScalingFactor {
     36 
     37   public TJScalingFactor(int num, int denom) {
     38     if (num < 1 || denom < 1)
     39       throw new IllegalArgumentException("Numerator and denominator must be >= 1");
     40     this.num = num;
     41     this.denom = denom;
     42   }
     43 
     44   /**
     45    * Returns numerator
     46    *
     47    * @return numerator
     48    */
     49   public int getNum() {
     50     return num;
     51   }
     52 
     53   /**
     54    * Returns denominator
     55    *
     56    * @return denominator
     57    */
     58   public int getDenom() {
     59     return denom;
     60   }
     61 
     62   /**
     63    * Returns the scaled value of <code>dimension</code>.  This function
     64    * performs the integer equivalent of
     65    * <code>ceil(dimension * scalingFactor)</code>.
     66    *
     67    * @return the scaled value of <code>dimension</code>.
     68    */
     69   public int getScaled(int dimension) {
     70     return (dimension * num + denom - 1) / denom;
     71   }
     72 
     73   /**
     74    * Returns true or false, depending on whether this instance and
     75    * <code>other</code> have the same numerator and denominator.
     76    *
     77    * @return true or false, depending on whether this instance and
     78    * <code>other</code> have the same numerator and denominator.
     79    */
     80   public boolean equals(TJScalingFactor other) {
     81     return this.num == other.num && this.denom == other.denom;
     82   }
     83 
     84   /**
     85    * Returns true or false, depending on whether this instance is equal to
     86    * 1/1.
     87    *
     88    * @return true or false, depending on whether this instance is equal to
     89    * 1/1.
     90    */
     91   public boolean isOne() {
     92     return num == 1 && denom == 1;
     93   }
     94 
     95   /**
     96    * Numerator
     97    */
     98   private int num = 1;
     99 
    100   /**
    101    * Denominator
    102    */
    103   private int denom = 1;
    104 }
    105